Mina Grott, Barcelona

The Grott Mine is a 1.5 km long tunnel in the Collserola mountains that connects Vallvidrera Marsh to the lower part of the Vallvidrera district near the Funicular.

The Grott Mine is a 1.5 km long tunnel in the Collserola mountains that connects Vallvidrera Marsh to the lower part of the Vallvidrera district near the Funicular. It was built in the 1850's to supply water to the old town of Sarria, fell into disuse, and later revived to transport water from Barcelona to San Cugat del Vallés and Sabadell.